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Correlation of Signals to Estimate Depth of Flaws

The "phase angle analysis" method or the "phase lag and log-amplitude analysis" method shall be used to estimate the depth of flaws.
In both cases the size (amplitude) of the signal is related to flaw surface area, and the phase angle is related to the flaw depth.
The method used shall be fully documented in the examination records and the relationship between flaw dimensions and signals shall be described. One or both methods may be used for flaw depth and size estimation.
T-1766.1 Phase Angle Method. A relationship of signal phase angles to reference flaw depths shall be developed for the examination being performed.
T-1766.2 Phase-Lag Method. A relationship of phase lag angle and log-amplitude of signals from the reference standard flaws shall be developed for the examination being performed.